Furnace



June 4, 1929.

E. TSCHIRA FURNACE Filed March 19, 1928 5 Sheets-Sheet l l NVENTOR Edward 75675814.

ATTORNEY E. TSCHIRA June 4, 1929.

FURNACE s Sheets-Sheet 2 Filed March 19, 1928 .m W Y ,Y. M M R Ma 0 E "H m.

Patented June 4, 1929.

PATENT OFFICE.

EDWARD TSCHIRA, OF DETROIT, MICHIGAN.

FURNACE.

Application filed. March 19, 1928. Serial No. 262,666.

This invention relates to improvements in furnaces, and aims to provide a furnace having a coking hearth so positioned behind a vertically movable grate that when the latter is in raised position all gases from the coking fuel pass through burning fuel on the grate; and having the grate so movable that when it is in lowered position coked fuel may be pushed from the hearth on to the top of the fire.

Another object of the invention is to provide a furnace having pusher mechanism both for forcing coking fuel onto the top of the fire on the movable grate when the latter is lowered, and for forcing fresh, or partly coked, fuel to the back of the hearth; and also a comb for preventing fuel forced rearwardly on the hearth from moving back with the pushing mechanism when the latter is withdrawn to the front of the furnace.

A further object of the invention is to provide a furnace having a firedoor over the front portion of the hearth provided with means for dropping the comb downwardly through the roof of the hearth when the door is opened, and for raising the comb the door is closed; and to provide an inner door in the main door so that when the former is open the comb remains in raised position.

Some of the other objects of the invention consist in providing a furnace: wherein longitudinal passages are provided along the inner side of the roof of the hearth to facilitate the movement of gases towards the grate when the hearth is packed with fuel; to provide means for holding the grate at relative heights above or below the level of the adjacent end of the hearth, and to provide the grate with downwardly extending portions to prevent fuel being pushed rearwardly off the hearth when the grate is in raised position; and wherein means are provided for admitting additional air into the combustion chamber over the grate as and when desired, and for admitting air into the hearth in regulated quantities through perforate side walls.

\Vith these and other objects in view, which will become apparent as the specification proceeds, the invention consists in certain novel construction and combination of parts hereinafter more fully described with the aid of the accompanying drawings, in which:

Figure 1 illustrates a sectional elevation of the invention showing the grate in both raised and lowered position.

Figure 2 is a section on the line 22 of Figure 1.

Figure 3 is a partial sectional elevation showing the pusher mechanism in its rearward position, the comb lowered and the firedoor open.

-Figure .1- is a section on the line ll of Figure 3.

Figure 5 is a perspective view of a detail.

Referring to the drawings, 1 designates a furnacehaving a coking hearth 2 with an imperforate floor 3. It will be notet that throughout the specification and claims in order to clearly differentiate between the front and rear portions of the furnace the former is referred to as the hearth 2, which expression is intended to include the whole of the front fuel containing portion. The floor 3 usually consists of slabs of firebrick, or other refractory material, and is placed on suitable rests a supported by cross members 5, which, in the present instance, extend the full width of the furnace and are supported by the sides 6 of the latter. These sides 6 are spaced from the sides 7 of the hearth so as to provide air spaces 8 therebetween. The sides 7 have air spaces 9. therethrough, and, in the present instance consist of a plurality of longitudinal portions 10 supported towards their extremities as shown at 11 and 12.

13 indicates a firedoor over the front portion of the hearth and is pivotally mounted at 14: on an upwardly extending wall 1.5 of the furnace; l6 denotes a cross wall extending over the rear portion of the hearth and has a plurality of longitudinal grooves 17 on its inner side.

I Movable longitudinally along the floor of the hearth is a fuel pusher 18 which extends the full width of the hearth and has upwardly extending fingers 19 which terminate in proximity to the underside of the roof. On the sides of the pusher are opposed shafts which project through the opposite sides'of the hearth between the longitudinal portions 10. On each shaft 20 a link 21 is mounted the opposite end of which is pivotally secured to an arm 22. Both arms are fixed on a shaft 23 supported in bearings 24 on the sides of the furnace, and one end of the shaft projects through one side 6 and has an operating lever thereon, so that by movement of the latter the pusher may be moved. 7

Between guides 9.6, held in spaced relation to the furnace wall 15, and the said wall a. combfZT is so mounted as to move vertically. To the door 13 arms 28 are secured, the opposite ends of which are pivotally fastened to links 29. The latter are pivot ally attached to the comb 27 so that as the door 18 is moved from closed to open position, that is from the position shown. in F igure 1 to that shown in Figure 3, the comb is lowered that its prongs 30 pass i'lownwardly through the roof of the hearth. hese prongs are of course so positioned transversely relative to the fingers 19 that the former pass downward between the latter.

The method of utilizing the fuel pusher and the comb is first to open the door 13 and place fuel on the floor of the hearth, then close the door thereby raising the comb. The pusher is then moved forward to force the fuel to the back of the hearth. The door is then opened again thereby lowering the comb so that the latter will prevent fuel from falling forward as the pusher is moved back to the front of the hearth. More fuel is then loaded into the hearth and moved by the pusher against the first pile. Then the door is closed thereby automatically raising the comb into its inoperative position. Should it be necessary at any time to open the door without moving the comb the inner door 31 hinged on the door 13 should be used. I

Dependingly arranged under the rear of the hearth are side members 32 between which a plate 33 ext-ends. The rear wall of the furnace has guides 34- thereon. Between the side members 32 and the guides 34-. is a vertically movable grate 35, having a pluralit y of bars 36. The rear portions of these bars are preferably upwardly inclined and terminate in proximity to the rear wall of the furnace; the intermediate portions of the bars are 1n-eferably inclined at substantially the same angle as the floor of the hearth, and the front bars 36 extend downwardly so that as the grate is raised and lowered, by means hereinafter described, these latter bars move up and down substantially in contact with the front of the plate 33. Projecting outwardly from the sides of the grate are opposed pins 37 to which arms 38 are pivotally attached. The opposite ends of the arms have links 39 fastened thereon, and the ends of the links remote from the arms are fixed on a cross shaft 40 which is adapted to be rotated by a lever 41. To one side of the furnace a segmental plate 42 is secured which has a plurality of notches 43 therein. The latter are adapted to receive a locking member 44 pivotally fastened to the lever ell and normally held in one of the said notches as by a spring 45.

When the furnace is burning normally coked fuel is burning on the grate and the latter is in its raised position. lileair while fuel on the floor of the hearth is be ing coked by the heat of the fire on the grate and gases passing from the coking fuel travel along the top of the hearth, and, if the latter is fully charged, along the longitudinal grooves 17 formed in the roof. 46 indicates the combustion chamber, the sides and top of which are usually lined with r fractory material, and 47 is a smoke pipe connection. hen fresh fuel is needed on the grate the latter is lowered to the bottom position shown in Figure l, and the coked fuel is moved thereonto by the pusher mechanism already described.

It is usually found that sufiicient air will pass through the hearth sides and througl the coking fuel to the fire, and in the course of its travel the air carries the gases from the coking fuel through the fire where they are consumed. If, however, additional air is needed openings 18 in the furnace wall 15 may be uncovered by turning the rotatable cover l9, thereby admitting air into the chamber 50 from which it may pass downwards into the hearth through apertures f 1. 52 designates small openings from the chamber 50 direct into the combustion chamber 46 so as to practically eliminate the possibility of gas collecting in the former cham her since the draw of the smoke pipe would tend to pull it through the combustion chamber and up the stack.

53 designates one form of ashpau which may be placed in the lower portion of the furance under the grate 35; and indicates a door in the front portion of the frame for admission of air which passes upwards between the furnace sides and the sides of the hearth. In order to start a fire in the first instance a firing door 56 is provided behind the grate so that fire may be built on the latter, and designates a door which may be opened to permit air to pass directly upwards through the grate when the fire is thus being started.

While in the foregoing the preferred embodiment of the invention has been described and shown, it is understood that the construction is subject to such modifications as fall within the scope of the appended claims.

lVhat I claim as my invention and desire to secure by Letters Patent is:

1. In a furnace, the combination of a hearth in which fuel is adapted to be coked having a floor therein, a vertically movable grate adapted to be lowered below the adjacent end of the hearth floor, pusher mechanism for moving fuel rearwardly in said hearth or from said hearth onto said grate, and said grate being adapted to be raised above the level of said hearth floor, so that gas passing from fuel coking thereon passes through fire on said grate, a combustion chamber formed over said grate, and a smoke pipe connection from said chamber.

2. In a furnace, the combination of a hearth in which fuel is adapted to be coked having .an imperforate floor, a vertically movable grate at one end of said hearth adapted to be set above, level with, or below the adjacent end of said hearth floor, pusher mechanism for moving fuel along said hearth and from said hearth onto said grate, means for preventing fuel from falling off the end of said hearth and under said grate when the latter is raised, a combustion chamber formed ,over said grate, and a smoke pipe connection from said combustion chamber.

3. In a furnace, the combination of a hearth in which fuel is adapted to be coked having a floor therein, an opening into said hearth, a firedoor covering said opening, a grate vertically movable adjacent to one end of said hearth, means for setting said grate at the desired height above, level with, or below the adjacent end of said hearth floor, said grate having depending bars at its end adjacent to said hearth which project below the hearth floor when the grate is raised to its highest position, and the roof of said hearth having a plurality of longitudinal grooves therein adapted to permit gas to pass therealong to fire on the grate when the hearth is fully charged.

i. In a furnace the combination of a hearth in which fuel is adapted to be coked, an opening into said hearth, a firedoor covering said opening, a pusher in said hearth for moving fuel rearwardly therein, means outside said fur race for actuating said pusher, an opening through thereof of said hearth, a comb movable vertically through said roof openin a vertically movable grate adjacent to one end of said hearth, a combustion chamber formed over said grate, and a smoke pipe connection from said combustion chamber.

5. In a furnace, the combination of a hearth in which. fuel is adapted to be coked, an opening through the top of the hearth towards the front of the latter, a liredoor on said hearth opening, a second opening through the roof of the hearth, a comb vert cally movable through said second opening, means for lowering said comb when said door is opened and for raising it when said door In a furnace, the combination of a hearth on which fuel is adapted to be coked,

an opening in the top of said hearth towards the front of the latter, a door pivotally mounted over said opening, a transverse opening in the roof of the hearth intermediately of its length, a comb vertically movable through said latter opening, means on said door for moving said comb, prongs dependingly secured to said comb, a pusher movable longitudinally in said hearth, upwardly projecting fingers on said pusher so spaced as to pass between said prongs, a grate vertically movable adjacent to the rear end of said hearth, a combustion chamber formed over said grate, and a smoke pipe connection from said chamber.

7. In a furnace, the combination of furnace sides, a hearth having perforate sides spaced from said furnace sides so that air spaces are formed between them, means for admitting air into said air spaces, a grate movable vertically at one end of said hearth and adjacent thereto, means for moving fuel along said hearth and onto said grate, the roof of said hearth having longitudinal grooves therein to facilitate the passage of gas to said grate, a combustion chamber formed over said grate, and a smoke pipe connection from said combustion chamber.

8. In a furnace, the combination of a hearth having an imperforate floor and sides with longitudinal openings therethrough, outer sides spaced from and enclosing the hearth sides thereby forming air spaces on the outer sides of said hearth, means for admitting air into said air spaces, a grate vertically movable adjacent the rear end of said hearth, a pusher movable longitudinally on said hearth, shafts on said pusher extending through said longitudinal openings in said hearth sides, means connected to said shafts for moving said pusher from outside the furnace, a combustion chamber formed over said grate, and a smoke pipe connection from said combustion chamber.

9. In a furnace, the combination of a hearth having a chamber formed over its rear portion, an opening over the front portion of said hearth, a fire door over said opening, the roof of said hearth having a transverse opening therethrough, a comb vertically movable through said transverse opening and adapted to rest either in said chamber or to be lowered into said hearth, a pusher movable longitudinally in said hearth for moving fuel rearwardly therein, the sides of said hearth being perforate,

its underside, a grate vertically movable adjacent the rear of said hearth, a combustion chamber formed over said grate, an air passage from said first chamber into said combustion chamber, and a smoke pipe connection from said combustion chamber.

EDWARD TSCHIRA. 

